Nobody has said that the biggest difference is made by withholding votes, but that organizing is far more important as far as action is concerned than voting. The purpose of organizing is to create educated, professional socialists that can then organize the rest of the working class, proliferate pro-socialist ideas, and explain core socialist theory, while struggling alongside the working classes in unionizing, protesting, and more. Revolution isn’t planned in advance, it happens when capitalism hits crisis, and an already-existing organization is capable of taking the working class to smashing and replacing the state. That requires a party that is already widely supported by the working class for proving itself through struggle. Utopia does not follow. What follows is even more intense struggle, but the establishment of worker control of society and the ability to direct production and distribution to meet the needs of the people. The fundamental problem with “taking over the DNC” is that you cannot replace the system built to reinforce capitalism brick by brick within it. The state in capitalism is a capitalist state, it isn’t a neutral state that takes on the character of whatever party is in power, but instead a state that takes on the character of whatever reinforces the economic base of society. That’s why revolution is necessary, even if the DSA split from the DNC and won every election.